Properties of Phenolic Resins CarboresP Binders for Magnesite Carbon Refractories

摘要

An environmental friendlx carbonaceous material- carboresP (one of the Carbores series materials) was investigated for the production of MgO-C refractories in laboratory scale and field tests. The MgO-C specimens were produced with different CarboresP contents. The bulk density (180 deg C X 48h), CCS, apparent porosity (1000 deg C X 3h) and hot modulus of rupture (1400 deg C X 5h) were tested and contrasted. The appropriate a-mount of carboresP was 1.0 percent. The amount of metallic additions can be partially substituted (reduced to 5 percent). The microstructure of resin-carboresP binder is anisotropic structure with high oxidation resistance and good thermal-shod; stability. The Stress/strain curve indicates that the characteristic length (L_(CH)) of MgO-C brick with resin/CarboresP bonding has been improved, which means the MgO-C bricks have good mechanical flexibility and stresses absorbability. Field tests were done in slag line of a 40t LF-VD refining steel ladle u-sing Resin/CarboresP bonded "MT-14A" MgO-C bricks. The result shows that the MgO-C bricks by "soft bonding" have good physical properties and excellent workability during production of the bricks. In contrast with traditional MgO-C brick used, for secondary refining furnaces, the spalling tendency of the bricks could be reduced significantly. The average lining life of the resin/CarboresP bricks has increased by 18. 4 percent comparing with the pure resin-bonded types.